Rule 603(a): OTC Trades in NMS stocks
Rule 603(a) of SEC Regulation NMS provides that any national securities exchange, national securities association, broker or dealer that distributes information with respect to quotations for or transactions in an NMS stock to a securities information processor, broker, dealer or other persons shall do so on terms that are not unreasonably discriminatory. In adopting Regulation NMS, the SEC stated that “adopted Rule 603(a) prohibits [a SRO] or broker-dealer from transmitting data to a vendor or user any sooner than it transmits the data to a Network processor.” Read More…